Load Mods From ~/.minecraft-pi; Prompt User For Custom Username On Startup

core/src/launcher.c

@@ -19,8 +19,6 @@ static int ends_with(const char *s, const char *t) {
     return strcmp(s + slen - tlen, t) == 0;
 }
 
-#define MODS_FOLDER "./mods/"
-
 static void set_and_print_env(char *name, char *value) {
     int length = strlen(value);
     if (value[length - 1] == ':') {
@@ -36,54 +34,77 @@ static char *get_env_safe(const char *name) {
     return ret != NULL ? ret : "";
 }
 
+static void load(char **ld_preload, char *folder) {
+    int folder_name_length = strlen(folder);
+    while (1) {
+        DIR *dp = opendir(folder);
+        if (dp != NULL) {
+            struct dirent *entry = NULL;
+            errno = 0;
+            while (1) {
+                entry = readdir(dp);
+                if (entry != NULL) {
+                    if (starts_with(entry->d_name, "lib") && ends_with(entry->d_name, ".so")) {
+                        int name_length = strlen(entry->d_name);
+                        int total_length = folder_name_length + name_length;
+                        char name[total_length + 1];
+
+                        for (int i = 0; i < folder_name_length; i++) {
+                            name[i] = folder[i];
+                        }
+                        for (int i = 0; i < name_length; i++) {
+                            name[folder_name_length + i] = entry->d_name[i];
+                        }
+
+                        name[total_length] = '\0';
+
+                        asprintf(ld_preload, "%s:%s", name, *ld_preload);
+                    }
+                } else if (errno != 0) {
+                    fprintf(stderr, "Error Reading Directory: %s\n", strerror(errno));
+                    exit(1);
+                } else {
+                    break;
+                }
+            }
+            closedir(dp);
+            return;
+        } else if (errno == ENOENT) {
+            char *cmd = NULL;
+            asprintf(&cmd, "mkdir -p %s", folder);
+            int ret = system(cmd);
+            if (ret != 0) {
+                exit(ret);
+            }
+        } else {
+            fprintf(stderr, "Error Opening Directory: %s\n", strerror(errno));
+            exit(1);
+        }
+    }
+}
+
 int main(__attribute__((unused)) int argc, char *argv[]) {
     fprintf(stderr, "Configuring Game...\n");
 
     char *ld_path = NULL;
+
     char *cwd = getcwd(NULL, 0);
     asprintf(&ld_path, "%s:/usr/arm-linux-gnueabihf/lib:%s", cwd, get_env_safe("LD_LIBRARY_PATH"));
     free(cwd);
+
     set_and_print_env("LD_LIBRARY_PATH", ld_path);
     free(ld_path);
-    
+
     char *ld_preload = NULL;
     asprintf(&ld_preload, "%s", get_env_safe("LD_PRELOAD"));
-    int folder_name_length = strlen(MODS_FOLDER);
-    DIR *dp = opendir(MODS_FOLDER);
-    if (dp != NULL) {
-        struct dirent *entry = NULL;
-        errno = 0;
-        while (1) {
-            entry = readdir(dp);
-            if (entry != NULL) {
-                if (starts_with(entry->d_name, "lib") && ends_with(entry->d_name, ".so")) {
-                    int name_length = strlen(entry->d_name);
-                    int total_length = folder_name_length + name_length;
-                    char name[total_length + 1];
 
-                    for (int i = 0; i < folder_name_length; i++) {
-                        name[i] = MODS_FOLDER[i];
-                    }
-                    for (int i = 0; i < name_length; i++) {
-                        name[folder_name_length + i] = entry->d_name[i];
-                    }
-                    
-                    name[total_length] = '\0';
+    load(&ld_preload, "./mods/");
+
+    char *home_mods = NULL;
+    asprintf(&home_mods, "%s/.minecraft/mods/", getenv("HOME"));
+    load(&ld_preload, home_mods);
+    free(home_mods);
 
-                    asprintf(&ld_preload, "%s:%s", name, ld_preload);
-                }
-            } else if (errno != 0) {
-                fprintf(stderr, "Error Reading Directory: %s\n", strerror(errno));
-                exit(1);
-            } else {
-                break;
-            }
-        }
-    } else {
-        fprintf(stderr, "Error Opening Directory: %s\n", strerror(errno));
-        exit(1);
-    }
-    closedir(dp);
     set_and_print_env("LD_PRELOAD", ld_preload);
     free(ld_preload);
 

debian/usr/bin/minecraft-pi

@@ -5,8 +5,10 @@ set -e
 # Ensure Features Are Selected
 if [ -z "${MCPI_SUBSHELL}" ]; then
     MCPI_FEATURES="$(zenity --class minecraft-pi --list --checklist --column 'Enabled' --column 'Feature' FALSE 'Touch GUI' FALSE 'Survival Mode' FALSE 'Fix Bow & Arrow' FALSE 'Fix Attacking' FALSE 'Mob Spawning' FALSE 'Show Clouds')"
+    MCPI_USERNAME="$(zenity --class minecraft-pi --entry --text 'Minecraft Username:' --entry-text 'StevePi')"
 fi
 export MCPI_FEATURES
+export MCPI_USERNAME
 
 # Start VirGL
 virgl_test_server &

debian/usr/share/minecraft-pi/docker-compose.yml

@@ -10,3 +10,4 @@ services:
         environment:
             - 'DISPLAY=unix${DISPLAY}'
             - 'MCPI_FEATURES=${MCPI_FEATURES}'
+            - 'MCPI_USERNAME=${MCPI_USERNAME}'

mods/src/extra.c

@@ -118,6 +118,14 @@ static void setIsCreativeMode_injection(unsigned char *this, int32_t new_game_mo
     revert_overwrite((void *) setIsCreativeMode, setIsCreativeMode_original);
 }
 
+static char *get_username() {
+    char *username = getenv("MCPI_USERNAME");
+    if (username == NULL) {
+        username = "StevePi";
+    }
+    return username;
+}
+
 __attribute__((constructor)) static void init() {
     if (has_feature("Touch GUI")) {
         // Use Touch UI
@@ -174,4 +182,11 @@ __attribute__((constructor)) static void init() {
     // Allow Connecting To Non-Pi Servers
     unsigned char patch_data_9[4] = {0x0f, 0x00, 0x00, 0xea};
     patch((void *) 0x6dc70, patch_data_9);
+
+    // Change Username
+    const char *username = get_username();
+    uint32_t username_addr = (uint32_t) username;
+    fprintf(stderr, "0x%08x", username_addr);
+    unsigned char username_patch[4] = {username_addr & 0xff, (username_addr >> 8) & 0xff, (username_addr >> 16) & 0xff, (username_addr >> 24) & 0xff};
+    patch((void *) 0x18fd4, username_patch);
 }